Hand clamping device for paper-cutting machines.



No. 680,656. Patented Aug. I3, IBM. 6. GRAY, In.

HAND GLAMPING DEVICE FOR PAPER CUTTING MACHINES.

(Application filed Oct. 12, 1.900.) (No Nodal.)

WITNESSES I m VENTOR 9%. WM. M

ATTORNEY UNITED STATES PATENT ()FFICE.

NIEL GRAY, JR., OF OSWEGO, NEW YORK, ASSIGNOR TO OSWEGO MACHINE WORKS,OF SAME PLACE.

HAND CLAM PING DEVICE FOR PAPER-CUTTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 680,656, dated August13, 1901 Application filed October 12, 1900. Serial No. 321859: (Nomodel.)

To all whom it may concern.-

Be it known that I, NIEL GRAY, J r., a citizen of the United States,residing at Oswego, in the county of Oswego and State of New York, haveinvented certain new and useful Improvements in Hand Clam pin g Devicesfor Paper-Cutting Machines; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates generally to papercutting machines, andparticularly to the hand clamping mechanism of such machines and it hasfor its object to provide a simple,

durable, and comparatively inexpensive device for hand-clamping the workand which is adapted for use on machines having poweroperated clampingdevices, as Well as those on which hand-clamps alone are used, thechange from hand to power, and vice versa, being accomplished withoutchanging the adjustment of any part of the machine; and it consists inthe parts and combinations of 2: parts hereinafter described andclaimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a perspective view from the rear of the front part of theframe; Fig. 2, an enlarged detail side o elevation of the device withcap g removed; and Fig. 8, a vertical section on the line 3 3, Fig. 2.

Similar letters refer to similar parts throughout all the Views.

As this invention relates only to the clam ping mechanism ofpaper-cutting machines, only such parts of such machines as areconnected with the operation of the clamp will be described.

Referring to the drawings, A represents the uprights of the frame of apaper-cutting machine, in which grooves a are formed for the straps b ofthe racks c, which are operated by the pinions d, mounted on a shaft 6,to lower the clamp B to the work, said straps being connected to theends of the clamp in the usual or'in any preferred manner. On one end ofthe shaft 0 are keyed the dog-leversf, which are'faste'ned to each otherby pins or screws g. One of the dog-levers, preferably the outer one, isformed with a circular hub or shoulder h, on which, between the twodoglevers, a worm-gear O has its bearing and is free to revolvetherebetween in either direction, said worm-gear having lugs i on eachside thereof adapted to engage with the doglevers f. A worm D, held in asuitable bearing it on the frame of the machine and operated by ahand-wheel Z, engages the wormgear 0, so as to rotate the same, saidworm being right-hand threaded, so that wheel Z when rotated in thedirection of the hands of a watch will bring the clamp down, thisarrangement being found most convenient for the operator. Thus uponrotating the hand wheel the worm-gear is turned in the direction of thearrow, Fig. 2, and causes the lugs i to engage the dog-levers, whichbeing keyed to the shaft 6 turn it, and through the pinions d and racksc pulls down the clamp to the work. Rotating the hand-wheel in theopposite direction permits the clamp to be raised either directly orindirectly by means of a counterbalance weight or springs or by anyother convenient or suitable means to its top position, such movementkeeping the lovers and lugs in engagement until the top position of theclamp is reached and it stops,

at which point the clamp-shaft e necessarily stops rotating and the lugsstart to leave the levers f. In order to prevent the wormgear from beingturned farther than is necessary and to prevent the dog-levers fromstriking theother sides of the lugs when the clamp is being operated bypower, (in which case the worm D and worm-gear C are stationary,) theteeth of the worm-gear are cut away for a suitable distance at a pointto one side of and near the ends of the lugs, as at m, so that when lugs11 leave the levers f the worm D would have no more teeth to engage andthe parts could not be operated by hand.

To prevent the worm-gear from thus running away from the worm and tohold it in a position ready to mesh with the worm when the latter isrotated, so as to pull the clamp down,

a lug or pin E projects from the worm-gear and engages a spring F,secured to the frame, both the pin and the spring being so locatedrelative to each other that the spring will begin to be compressed bythe pin as soon as the Worm nears the last tooth in the wormgearadjacent the cut-away space, and thus prevent the Worm-gear beingrotated out of mesh with worm.

G is a safety-cap secured to the shaft e over the dog-levers.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a paper-cutting machine, the combination with a clamp and a shaftfor operating the clamp, of a worm-gear loosely mounted on said shaft, aworm engaging said gear, and means for coupling said gear andshaft,whereby the rotation of the worm rotates the shaft.

2. In a paper-cutting machine, the combination with a clamp, and a shaftfor operating said clamp, of a Worm-gear loosely mounted on said shaft,aworm meshing with said wormgear, and dog-levers for engaging said gearsecured to said shaft, Wherebysaid shaft may be rotated by said worm.

3. In a paper-cutting machine, the combination with aclamp, and a shaftfor operating said clamp, of a worm-gear loosely mounted on said shaft,aworm meshing with said wormgear, and means for automatically couplingsaid worm-gear and shaft upon rotation of said worm.

4. In a paper-cutting machine, the combination with a clamp, and a shaftfor operating said clamp, of a worm-gear loosely mounted on said shaft,means for coupling said gear and shaft, a Worm for operating said gear,and means for limiting the rotation of said Wormwheel.

5. In a paper-cutting machine, the combination with a clamp, of ashaftfor operating said clamp, dog-levers secured to said shaft, a Worm-gearloosely mounted on said shaft, lugs projecting from said worm-gear intothe path of said dog-levers, and a worm for operating said worm-gear.

6. The combination with the clamp-shaft of a paper-cutting machine, of aWorm-gear havinga recessed untoothed portion on its periphery,looselymounted on said shaft, a worm engaging said worm-gear, and means forstopping the motion of said Worm-gear at a predetermined point in itsrotation, whereby the gear is always held in mesh with the Worm.

In testimony whereof I affix my signature in presence of two witnesses.

a NIEL GRAY, JR.

Witnesses:

ELISHA B. POWELL, JAMES OGRADY.

